Plant Wilt Sensor. Simple Design 18


PLANT WILT SENSOR CIRCUIT

This simple circuit tells you whether your Interior plant requires water or not. When the soil dry up, the Red LED lights to inform you that, the plant needs water. So this saves the life of your valuable interior plants.
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Flip-Flop control using LDR. Sensor Circuit 10


IC 555 has an internal Flip-Flop and its working determines the output state of the IC. The discharge input of the IC has an NPN transistor with open collector. The On/Off of this transistor also depends on the state of the Flip-Flop. The Flip-Flop is under the control of the lower and upper comparator of the IC which can be independently controlled by external voltage. Here two LDRs are used for controlling the comparators.

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Movement Detector. Sensor Circuit.4


Here is an LDR based movement detector for day time use. It is highly useful in shops, banks etc to confirm the entry and exit of persons. It uses two LDRs and the popular timer IC555.

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